Impact of Sub-Lethal Exposure to Insecticides on Vector Control Lee Cohnstaedt and Sandra Allan...

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Transcript of Impact of Sub-Lethal Exposure to Insecticides on Vector Control Lee Cohnstaedt and Sandra Allan...

  • Slide 1
  • Impact of Sub-Lethal Exposure to Insecticides on Vector Control Lee Cohnstaedt and Sandra Allan USDA-ARS-CMAVE Triservices Meeting Feburary 2010 Lee Cohnstaedt and Sandra Allan USDA-ARS-CMAVE Triservices Meeting Feburary 2010
  • Slide 2
  • Insecticide contact
  • Slide 3
  • Pyrethroids
  • Slide 4
  • If not dead, then what?
  • Slide 5
  • Mosquito species
  • Slide 6
  • Behavioral assays Entrance Air+ CO 2 *Capillary release attractant *CO 2 release 50ml/min Attractant *Infrared light was used illuminate nocturnally active mosquitoes. *Treatment level lethal dose 25
  • Slide 7
  • Flight path analysis Untreated Cx. quinquefasciatus Deltamethrin treated Cx. quinquefasciatus
  • Slide 8
  • Flight path analysis Untreated An. albimanus Permethrin treated An. albimanus
  • Slide 9
  • Flight path analysis Treated Ae. aegypti Untreated Ae. aegypti
  • Slide 10
  • Average flight velocity * *
  • Slide 11
  • Time in flight * *
  • Slide 12
  • Heading * *
  • Slide 13
  • Blood feeding *
  • Slide 14
  • Implications The sublethal affects of pyrethroids on a mosquitos ability to detect and locate hosts may increase the efficacy of aerial and residual spraying treatments beyond their immediate killing impact.
  • Slide 15
  • Personal protective measures Band Sleeve Phlebotomus papatasi
  • Slide 16
  • TreatmentHandBandSleeve Bite protection Untreated20 (29%)11 (16%)37 (54%)--- Sleeve (permethrin)43 (26%)40 (24%)84 (50%)-28.5% Sleeve (permethrin) + Band (TL-I-73) 129 (27%)86 (18%)269 (56%)16.9% Band (TL-I-73)39 (49%)12 (15%)28 (35%)21.8% Sleeve (permethrin) + Band (UB-21) 27 (40%)12 (18%)28 (41%)94.1% Number of landings per 20 minutes Landing site
  • Slide 17
  • Band Sleeve
  • Slide 18
  • Implications Sand flies predominantly land on the sleeve before moving towards the exposed skin; therefore a lethal insecticidal barrier at the uniform-skin interface will reduce disease transmission.
  • Slide 19
  • Acknowledgments Uli Bernier Matt Aubuchon Adrian Duehl Erin Vrzal Nathan Newlon